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76 lines
2.8 KiB
C++
76 lines
2.8 KiB
C++
/****************************************************************************
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*
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* Copyright (C) 2012-2019 PX4 Development Team. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name PX4 nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#pragma once
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#include <mixer/Mixer/Mixer.hpp>
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/**
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* Null mixer; returns zero.
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*
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* Used as a placeholder for output channels that are unassigned in groups.
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*/
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class NullMixer : public Mixer
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{
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public:
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NullMixer() : Mixer(nullptr, 0) {}
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virtual ~NullMixer() = default;
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// no copy, assignment, move, move assignment
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NullMixer(const NullMixer &) = delete;
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NullMixer &operator=(const NullMixer &) = delete;
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NullMixer(NullMixer &&) = delete;
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NullMixer &operator=(NullMixer &&) = delete;
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/**
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* Factory method.
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*
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* Given a pointer to a buffer containing a text description of the mixer,
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* returns a pointer to a new instance of the mixer.
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*
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* @param buf Buffer containing a text description of
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* the mixer.
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* @param buflen Length of the buffer in bytes, adjusted
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* to reflect the bytes consumed.
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* @return A new NullMixer instance, or nullptr
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* if the text format is bad.
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*/
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static NullMixer *from_text(const char *buf, unsigned &buflen);
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unsigned mix(float *outputs, unsigned space) override;
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unsigned set_trim(float trim) override { return 1; }
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unsigned get_trim(float *trim) override { return 1; }
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};
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